Adjusting device for thermometers



N0. 6|2,5l8. Patented Oct. I8, I898. J. H. HERBENER.

ADJUSTING DEVICE FOR THERMOMETERS.

(Application filed Dec. 18, 1897,)

No Model.)

.12. THE NORRIS PETERS co, Pncnoumu, WASNINGTON. u

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JOHN H. IIERBENER, OF NORTHVIIJLE, MICHIGAN.

ADJUSTING DEVICE FOR THERMQMETERS.

SPECIFICATION forming part of Letters Patent No. 612,518, dated October18, 1898.

4 Application filed December 18, 1897. Serial No. 662,475. (No model) T0on whom it may concern.-

Be it known that 1, JOHN H. HERBENER, a citizen of the United States,residing at Northville, in the county of lVayne and State. of Michigan,have invented a newand useful Adjusting Device for Thermometers,of whichthe following is a specification.

This invention relates to adjusting devices for the tube of athermometer, its object be in g to provide the thermometer with a simpleand efficient adjustable device by means of which the tube maybeadjusted on the scaleplate should the thermometer become inaccurate.

lVith this object in view the invention consists of the several detailsof construction, combination, and arrangement of parts, as will behereinafter fully described, and particularly pointed out in the claims.

In the drawings, Figure 1 is a perspective view of a thermometerprovided with my improved adjusting device. Fig. 2 is a rear side viewof the thermometer. Fig. 3 is a section on the line 3 3 of Fig. 2. Fig.4 is a perspective view of the adj ustingmechanism detached.

Similar reference-numerals indicate similar parts in the severalfigures.

1 indicates the scale-plate of the thermometer, such as is commonly usedin incubators, and is cut out at one end to form a recess 2. The scaleis indicated by 3, the tube by 4, and the bulb by 5. The bulb will bepartially within the recess 2 in order that it may be free to move inthe recess longitudinally of the plate. The tube is supported near thebulb by a loop 6, which is preferably detachablyconnected to theplate,and the tube will be free to move longitudinally in the loop. The end ofthe tube remote from the bulb will be secured to the adjusting device,which I will now describe. Aslot 7 is made in the end of the scale-plateand extends in alinement with the tube, forming ways to receive asliding nut, which is coupled to the thermometertube. The nut 8, whichconstitutes a slide, is provided with slots 9 in. opposite sides toreceive the edges of the plates on each side of the slot, and thus besupported to slide in the slot longitudinally thereof. The front side ofthe nut 8 is provided with a curved recess 10 to form a seat for thetube, and the 15 indicates a block or head provided with slots 16 to fitover the edges of the metal at the open end of the slot, and this headis firmly secured to the plate by solder or other- Wise. The head isprovided with an opening for the passage of the stem of theadjustingscrew 17, which is threaded for a portion of its length andfits in the threaded opening in the nut 8. Near the head 18 of theadjustingscrew the stem is provided with an annular groove 19, intowhich the set-screw 20, in one side of the block 15, is adapted to enterand prevent longitudinal movement of the adj usting-screw in the blockand also when tight ened up preventing its rotary movement, therebypreventing accidental movement of the tube longitudinally. \Vhen,however, it is necessary to correct the thermometer, the set-screw 20can be loosened and the adjusting-screw turned, which will have theeffect of causing the nut 8 to travel on the screw, and thereby shiftthe position of the tube relatively to the scale in either direction, asmay be required.

From the foregoing description it will be seen that should thethermometer become inaccurate the tube maybe easily shiftedlongitudinally of the scale to correct the inaccuracy. The testing ofthe thermometer may be done in several Ways, one of the easiest being totake a thermometer known to be correct and place it side by side withthe thermometer to be tested in warm water. If the thermometer beingtested is inaccurate, the tube can be adjusted until accuracy isattained.

While I have illustrated and described my invention as applied to athermometer specially adapted for use in incubators, I do not intend tolimit its use to such thermometers, as it may be attached to thescale-plates of other styles of thermometers, and it is also to beunderstood that changes in the form, proportion, and the minor detailsof construction may be resorted to without departing from the spirit orsacrificing any of the advantages of this invention.

Having thus described the invention, what I claim is 1. In athermometer, the combination of a scale-plate, a slide mounted on thescale-plate and provided with a curved recess, means for adjusting theslide, and a thermometer-tube guided on the scale-plate and provided atits closed or solid end with a lip 11, and having the said end seated-inthe curved recess of the slide and positively coupled to the samecontiguous to the lip 11, whereby it is capable of adjustment ineither-direction, substan-' tially as described.

2. In a thermometer, the combination of a scale-plate provided with aslot extending i11- ward from one end, and a slide arranged in the slotand provided at opposite sides with 20 JOHN H. HERBENER.

Witnesses:

J. E. THOMPSON, HARRY S. GERMAN.

